Phonographic apparatus



Jan. 6, 1942. E, Q UED N 2 2,269,263

PHONOGRAPHIC APPARATUS Filed Sept. 28, 1940' ZSnventor Patented Jan. 6,1942 PHONOGRAPHIQ APPARATUS EmileC. Guedon, Audubon, N. 1., designer toRadio Corporation of America, a corporation of I ware ApplicationSeptember 28,1940,- Serial No. 358,758

I 6 dlaims. This invention relates to Phonographic apparatus, and moreparticularly to a pickup-,Jarm mounting, the present invention being animprovement upon that disclosed and claimed in Patent No.'2,176,669granted to me-on October- In the aforesaid patent, there is disclosed apickup arm mounting which is designed to'be free from rattles when; thepickup arm is mounted thereon. Essentially, the construction of thispatent comprises a U-shaped spring member carrying oppositely disposedconical bearin elements which are received in corresponding openings inthe pickup arm. This particular construction is.designed to provide anadequate beartension of which can be adjusted to eiiect the necessarypressure of the bearing elements against the pickup arm. Thus, it isobvious that any mounting formed in accordancewith my present inventioncan be readily accommodated to any pickup arm.

The novel features that I consider character- I istic of my inventionare set forth wlth'particuing structure for the pickup arm without thenecessity of maintaining close tolerances. It has been found in practicethat, in a construction of this sort, the pressure of the bearingelements against the pickup arm resulting from the tension in the springoccasionally produces friction to a degree which hampers the freemovement ofthe pickup arm in a vertical direction relative to therecord, and the primary object of my present invention is to provide animprovedpickup arm mounting which will be-free from this difli'culty.

More particularly, it is an object of my present,

invention to provide animproved pickup arm mounting wherein theengagement between thel bearing elements and the pickup arm can belarity in the appended claims. The invention itself, -however, both asto its organization and method of operation, as wen as additionalobjects and advantagesthereof, will best be understood I from thefollowing description of one'embodiment thereof whenread in connectionwith the accompanying drawing in which a Figure 1 is a top plan view'ofa pickup arm and mounting therefor constructed according to my presentinvention, the pickup arm being partly broken away and shown in sectionfor the sake of clearness.

Figure 2 is a side elevation thereof with the pickup arm shown insection, and

Figure 3 is a. perspective view of the mounting member.

Referring more .particularly'to the drawing,

'wherein similar reference characters designate correspondingpartsthroughout, there is shown a motor board I in which is set arbushing 3which readily adjusted until thedesired free swinging movement of thepickup arm on its support is obtained, a t 1 Another object of mypresent invention isto "provide an improved pickup arm mounting asaforesaid by means of which it is possible to provide adequatecompensation for variations in production.

It is another object of my present invention to. 'provide an improvedpickup arm mounting'as above set forth which is inexpensive ofmanufacture, which readily lends itself to rapid,

economical quantity manufacture, on which the pickup arm can be mountedeasilyand duickly,

and. which can be readily adjustedto suit the requirements of anyparticular pickup arm.

In accordance with my present invention, I

provide a basememberwith a pair of conically tipped bearing elementswhich are'received in suitable openings in the pickup arm, one of theelements being mounted on a rigid member forming a part of the base, andthe other of thebearing elementsbeing. mounted. on; an adjustable,

resilient member, such as-a spring blade, the

receives a shaftor post 5 for rotation therein, the post 5 extendingupwardly to a point above the bushing 3. Fixed to the upper end ofthepost 5 is a plate 1 constituting the 'base of the mounting, the baseI beingprovided with an integral and rigid upstanding lug or projectionQ on one side thereof and in proximity to the post 5, and with two othersimilar lugsor projections H and on theother side-of the base I, theprojection ll being mostremote from the post 5 and the projection l3,which is provided with a threaded opening I I. being locatedintermediate the Projections 9 and H;

Seeuredto the projection-ll is a springblade I! which extends toward thepost 5 past the projection II and to a point such that it.

is free and is substantially opposite the projection 8. The spring bladeI! is provided with an -open.*ng I! through which) screw it freelypasses, the screw 2| being threadedin the openin: II and its head thespring blade l'l. ,The projection I and the free end of fthe springblade II have secured thereto a pair of substantially. axially aligned,outwardly directed conical bearing members 28 whichare received in apair oico aligned openingstladiacentoneendotamitableplckw 2 arm 21, thepickup arm 21 being of hollow construction similar to that disclosed inmy abovenoted patent and substantially concealing therein the mduntingbase I and the parts carried thereby when it is inoperative position onthe bearacterized in that said tension-varying means is constituted by ascrew adjustably carried by said screw 2! one way or the other, thespring blade 7 l1 may be flexed, more or less, to vary its tension andhence the friction at the bearings. The

pickup'arm 21 may be readily mounted on the bearing 23 bymerely-pressingthe blade H to-- ward the projection]; to enable the bearings 23to'clear the side walls of the pickup arm, after which the bearings maybe snapped into the openings'25. The blade I1 is normally biased in anoutward direction away from the projection l3. Thus, if it is found thatthe pickup arm is looseon the bearings 23 in a transverse direction,

the screw 2| maybe manipulated to permit theblade II to spring awaysomewhat more from the projection i3. On the otherhand, if the pickuparm 21 is found to bind on the bearings, the screw 2! may be manipulatedinthe opposite direction to move the spring-closer to the projection l3.In this way. the desired bearing pressure can be easilyand quicklyadjusted to the extent necessary.

Although I have shown in the one described, are possible within thescope of my invention. 1 therefore desire that my invention shall not belimited except insofar as is made necessary by the prior art and by thespirit of the appended claims, j

Iclaimasmyinvention:

1. In phonographic apparatus, a pickup arm, and a mounting therefor,said mounting including a base, a rigid member on said base, a hearingelement carried by said rigid member, a resilient member carried by saidbase in spaced relation to said rigid member, and a second hearingelement carried by said resilient member in substantially axialalignment with said firstnamed bearing element, at least one of saidmembers being adjustable on said base relative to the other of saidmembers for varying the spacing of the bearing elements carried thereby,and said arm being pivotally carried by said bearing elements. a g

2. In pbonographic apparatus, a pickup arm.

- and amounting therefor, said mounting includ-;

ing a base, a rigid member upstanding from said base in fixed relationthereto, a bearing element said first-named bearing element, said armbeing pivotally carried by said bearing elements, means for varying thetension of said resilient member whereby to adjust said secondbearingelement relative to said first-named bearing element.

3. The invention set forth in claim 2 charbase, said screw passingthrough said resilient member andthe head of said screw engaging shidresilient member.

-4. The invention set forth in claim 2 emir-v acterized in that said armis provided with .a pair of aligned openings adjacent one end thereof,

characterized further in that said bearing elements are constituted byconical members fitted into said openings, and characterized stillfurther in that said conical members are retained in said openingssolely by the resilience of said resilient member, the tension of saidresilient memher being variable for adjustment of the iit of a saidconical members in said openings;

and described but a single embodiment of my invention, it will beobvious to those skilled in the art that manyother modificationsthereof, as well as changes carried by said rigid member, a resilientmemberaecuredatoneendtosaidbaseinspaced relation to said-rigid member, asecond bearing element carried'by the free end of said resilientmanta-em substantially m] alignment with 5. A support for a pickup-armcomprising a post, a base secured to said post, an upstanding member onone side-10f said base, a bearingelement secured to said member, asecond upstanding member on the opposite side of said base and.

spaced from said first-named member longitudi nally along said base, athird upstandingmemher on said base intermediate said first andsecond-named members, a spring blade secured to said second-named memberand extending past said third member to a point opposite saidfirst-named member, a second bearing member on the free end ofsaid'blade in substantially axial'alignment with said first-namedbearing element, and means adjustably carried on said third membercooperatively associated'witn said blade for varying the tension of saidblade as member, a second upstanding member on the opposite side of,said base remote from said po t, a third upstanding'member on saidlast-named base side intermediate saidilrst andesecondnamed members,member having a threaded opening thereima spring blade secured to saidsecond-named" member and extending toward said said third member andto apoint opposite said first-named member, said blade having openingtherein align d with said threaded opening, a second bearing member onthe free engLot said bladerin substantially axial alignmentwith dfirst-named bearing element, a said second-named'iopening threadreceived in said threaded opening, the head oisaid screw being adaptedtoengagejsaid blade and to vary the tension therein'assaid screw isadjusted 1mm: dotmnou.

